Computer Simulation appears to be necessary to a well understanding of Complex Systems. Human societies, economics or organizations could be considered as complex systems in which the behavior of the system as a whole highly depends on the interaction between individual parts. Due to climate changes, the increasing number of natural disasters and other ecological troubles, the value of simulations appears even more clearly. Lot of works try to provide decision-making support systems to handle such crisis situations. They aim at defining policies to prevent these problems or rescue protocols in case they occur, \emph{e.g.}~\cite{CHU:08}.

%Computer Simulations become more and more necessary to a well understanding of complex phenomena. Due to climate changes, upsurge of natural disasters and other ecological problems, several works try to give decision support of sticky situations. They aim at preventing these problems or defining protocols to solve them~\cite{CHU:08}.

One use of computer simulations is to reproduce emergency situations such as disaster occurrence in order to train stakeholders (\emph{e.g.} rescue troops, policemen or politicians) to react appropriately in critical situations. To a better learning, users have to be \emph{in} the simulation and play the game, \emph{i.e.} to control their agent and to interact with other agents (autonomous or controlled by other stakeholders).
Such a simulation is named ``participatory simulation'' \cite{Murakami:2006}. %and users are players. 
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Works such as the COmpanion MODeling (Comod) approach~\cite{ETI:2010} lead to the creation of participatory games and the development of participatory simulators. For example, the E-ComMod game tackles the actual issue of the sustainable resource management and exploitation~\cite{Guyot:2004}. But major elements of participatory games such as the Air Traffic Management game (to train decision making in an air flow stress)~\cite{Minh:2008} or the Smach simulator (analyzing daily activities of family individuals)~\cite{Sempe:2010} are constructed separately, from scratch, without any possibility of reuse.

Games rules of participatory simulators are widely identified whereas accompaniment are not thorough, \emph{i.e.} tools supporting remote exchanges between stakeholders are neglected. Contrarily, the domain of collaborative systems provides tools and media supporting interactions between stakeholders but does not offer the possibility to play some simulators. 
Groupwares such as  PAMS~\cite{PAMS:2009}, GPGCloud~\cite{GPGCloud:2009} or simExplorer\footnote{http://www.simexplorer.org/} combine generic collaborative tools and simulation tools in didactic and user-friendly suites. For example, the PAMS groupware associates video-conferencing, white-board, file sharing with simulator control panels. Because of its genericity, PAMS can be used in a wide span of research areas as  biology, ecology, economy and so on.


The aim of our work is to develop a portal taking advantage of advances in both collaboration domain and participative simulation domain. We intend to extend the PAMS portal by new participatory simulation features. This new platform will thus combine generic collaborative tools (video conferencing, chat, white-board) allowing direct interactions between stakeholders with participatory games tools (interactive individualized interface). This add-on offers a simple way to a participatory game designer to define its scenarios and to deploy them on the portal by profiting from existing collaborative tools. The paper presents how participative simulations are taken into account in the PAMS groupware: how a dedicated user interface can be configured and displayed without altering the simulator implementation.

The paper is organized as follows. Section~\ref{sec:def} defines what is a participative simulation and presents needed features of a participative simulation framework. In Section~\ref{sec:metamodel} we propose a meta-model for such a framework and we details its implementation in the PAMS portal in Section~\ref{sec:integration}. Finally, in Section \ref{sec:application} we present an application case on the GAMAVI \cite{Amouroux:2010} model to validate our implementation.

